Schedule I - Condensed Financial Information of Parent Company (Parenthetical) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Nov. 04, 2011
Condensed Financial Statements, Captions [Line Items]
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	79,653,624	79,653,624
Common stock, shares outstanding	79,653,624	79,653,624	7,019,550
PNM Resources [Member]
Condensed Financial Statements, Captions [Line Items]
Accumulated Depreciation	$ 9,167	$ 8,262
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	120,000,000	120,000,000
Common stock, shares issued	79,653,624	79,653,624
Common stock, shares outstanding	79,653,624	79,653,624